Развитие метода корреляции цифровых изображений применительно к механическим испытаниям при повышенных температурах
Автор: Струнгарь Е.М., Лобанов Д.С.
Статья в выпуске: 3, 2022 года.
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Представлены результаты экспериментальных исследований по оценке работоспособности бесконтактной оптической видеосистемы Vic-3D и метода корреляции цифровых изображений при испытаниях на растяжение композитов в условиях нормальной и повышенных температур. Проанализированы зависимости регистрируемых значений деформации двумя независимыми методами измерений: метод корреляции цифровых изображений (КЦИ) и навесной экстензометр. Испытания проводились в Центре экспериментальной механики Пермского национального исследовательского политехнического университета на универсальной электромеханической испытательной системе Instron 5882, в состав которой входит термокамера с рабочим диапазоном температур от -100° до +350 °С. Исследовались образцы композиционного материала, изготовленного из стеклотекстолита СТЭФ и углепластика. Испытания на растяжение проводились при температурах 22°, 100°, 120°, 200° и 300 °С. Предложены рекомендации по проведению температурных испытаний с использованием метода КЦИ. По результатам испытаний построены диаграммы деформирования. Получены поля и эпюры продольных деформаций при разных уровнях температур. Проведена подробная оценка мелкодисперсного покрытия, необходимого для реализации метода КЦИ при температурных испытаниях.
Метод корреляции цифровых изображений, полимерный композиционный материал, экспериментальная механика, напряженно-деформированное состояние, повышенные температуры, испытания на растяжение
Короткий адрес: https://sciup.org/146282544
IDR: 146282544 | УДК: 620 | DOI: 10.15593/perm.mech/2022.3.15
Development of the digital image correlation (DIC) method for mechanical testing at elevated temperatures
The results of experimental studies on the evaluation of the performance of the non-contact optical video system Vic-3D and the digital image correlation method during tensile tests of composites under normal and elevated temperatures are presented. The dependences of the recorded strain values are analyzed by two independent measurement methods: the digital image correlation method (DIC) and a mounted extensometer. The tests were carried out at the Center of Experimental Mechanics of the Perm National Research Polytechnic University using the Instron 5882 universal electromechanical testing system, which includes a thermal chamber with an operating temperature range of -100° to +350 °С. Samples of a composite material made of STEF fiberglass and carbon fiber were studied. Tensile tests were carried out at temperatures of 2°2, 100°, 120°, 200°, and 300°C. Recommendations for conducting temperature tests using the DIC method are proposed. Based on the test results, deformation diagrams were constructed. Fields and diagrams of longitudinal deformations are obtained at different temperature levels. A detailed evaluation of the finely dispersed coating required for the implementation of the DIC method in temperature tests has been carried out.
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